JP2784674B2 - Weft lock pin device for loom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a shuttleless loom for unwinding and inserting a predetermined length of weft from a drum type weft measuring and storing device at a predetermined time. The present invention relates to a weft locking pin device of a loom to be used.

2. Description of the Related Art In shuttleless looms, a drum type weft length measuring and storing device (hereinafter, simply referred to as a length measuring device) is widely used to measure and store a weft.

A so-called locking pin is used to unwind the weft stored in the length measuring device by a predetermined length at a predetermined time and execute an accurate weft insertion operation. The locking pin moves forward and backward with respect to the surface of the drum on which the weft is wound and stored, so that the locking pin prohibits the weft from being unwound from the drum, and the unwinding position for allowing this. Can be taken.

The operation of the locking pin is preferably as high as possible in order to stably realize an accurate weft insertion operation corresponding to the high-speed operation of the loom. For this reason, a so-called double solenoid type locking pin is proposed. (Shikai 63
-94986). This is provided with a rod-shaped plunger made of a ferromagnetic material, a locking solenoid that exerts a magnetic force on the plunger, and an unwinding solenoid.
A pin is formed at one end of the plunger, the plunger is driven by alternately exciting the locking solenoid and the unwinding solenoid, and the pin is driven to two positions, a locking position and an unwinding position. Things.

Problems to be Solved by the Invention According to the related art, the pin for locking the weft is formed only at one end of the plunger. If a thread hit (scratch caused by contact with the thread, the same applies hereinafter) occurs in the thread, the entire plunger must be replaced, and depending on the thread type, the service life of the plunger becomes too short and the running There was a problem that the cost would be excessive. Further, since the entire plunger is made of a ferromagnetic material, if the locking solenoid and the unwinding solenoid are arranged close to each other in order to reduce the size and weight of the entire plunger, the solenoid from one of the solenoids will not work. Since the leakage magnetic flux links to the other solenoid via the plunger, the operation thereof may be unduly slowed.

Accordingly, an object of the present invention is to provide a plunger made of a non-magnetic material, and a suction member made of a ferromagnetic material is divided and fixed to the plunger to prevent leakage between the two solenoids. To provide a weft locking pin device for a loom capable of minimizing magnetic flux, improving overall responsiveness, and forming locking portions at both ends of a plunger to double the life of the plunger. It is in.

Means for Solving the Problems In order to achieve the above object, the present invention provides a locking pin body, a locking solenoid for driving the locking pin body to a locking position, and a locking pin unwinding position. The locking pin main body includes a nonmagnetic material plunger that is movably inserted into the locking solenoid and the unwinding solenoid, and a nonmagnetic material that is attached to an intermediate portion of the plunger. The gist of the invention is to form a stopper and a pair of ferromagnetic suction members fixed to the plunger on both sides of the stopper, and to form weft locking portions at both ends of the plunger.

A plurality of spacers are interposed between the locking solenoid and the unwinding solenoid, and a part of the spacer is moved to the upper surface side of the unwinding solenoid so that the stroke of the locking pin body can be changed. Alternatively, the plunger may have different projection lengths on both sides of the stopper.

According to this configuration, the plunger is commonly inserted between the locking solenoid and the unwinding solenoid. However, since the plunger is made of a non-magnetic material, the plunger is made of a magnetic material. There is no possibility that the resistance is unduly reduced through the plunger. Therefore, the leakage magnetic flux between the two solenoids can be reduced, and the response speed can be improved. In addition, since weft locking portions are formed at both ends of the plunger, if one of the locking portions encounters a yarn hit, use a new locking portion by replacing the plunger upside down. Is possible.

The spacer interposed between the locking solenoid and the unwinding solenoid determines the interval between the locking solenoid and the unwinding solenoid, and the stopper moves within this interval to determine the stroke of the locking pin body. it can. Therefore,
If this spacer is divided into a plurality of parts and a part thereof is moved to the upper surface side of the unwinding solenoid, the stroke of the locking pin body can be easily changed by changing the interval for moving the stopper. it can. The smaller the stroke of the locking pin body, the better the responsiveness and can be adapted to a high-speed operation of the loom. However, the minimum stroke is limited by the thickness of the weft used.

When using a plunger with different projection lengths on both sides of the stopper, the locking pin body was driven to the locking position by using one locking portion with different projection lengths according to the length of the stroke. At this time, the depth at which the locking portion enters the drum surface can be made constant.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

A weft locking pin device (hereinafter, simply referred to as a locking pin device) of a loom includes a locking pin body 10, a locking solenoid 21,
The unwinding solenoid 22 is used as a main member (FIG. 1),
It is housed integrally in a case composed of a body 23 and a cover 24.

The body 23 has a space 23 for accommodating components including the locking pin body 10, the locking solenoid 21, and the unwinding solenoid 22.
This is a container-like member that forms a space a and a space 23b for drawing out an electric wire from the locking solenoid 21 and the unwinding solenoid 22 (FIG. 2). The bottom of the body 23 is provided with a through hole 23c through which the locking pin body 10 penetrates, and the lower part of the front surface is provided with a tongue piece 23e formed with a mounting hole 23d for accommodating the unwind sensor. It is protruding. Further, a screw hole 23f for screwing the whole to the bracket BK is formed in the upper part of the rear surface. Here, the unwinding sensor is a sensor for detecting a weft (not shown) unwound from the drum D of the length measuring device, and for example, a reflective optical sensor with an optical lens can be used. .

The cover 24 is fixed to the upper surface of the body 23 via set screws 24c, 24c (FIG. 3), and has a through hole 24a through which the locking pin main body 10 penetrates, and an electric wire drawing hole 24b. However, through hole 24a
Corresponds to the through hole 23c of the body 23, and
It is assumed that it is on the axis CL of 3a (FIG. 2).

The locking solenoid 21 and the unwinding solenoid 22 are housed in a space 23a of the body 23 in two layers (FIGS. 1 and 3).

The locking solenoid 21 and the unwinding solenoid 22 are respectively
The cylindrical solenoid holders 21a and 22a and the bobbins 21b and 22b with flanges are combined into a cylindrical shape, and faced via two ring-shaped spacers 25a and 25b having different thicknesses. On the other end sides of the locking solenoid 21 and the unwinding solenoid 22, yokes 21d and 22d are mounted. Here, the solenoid holders 21a and 22a, the bobbins 21b and 22b, the yoke 21
Preferably, d and 22d are each made of a ferromagnetic material, and spacers 25a and 25b are preferably made of a non-magnetic material. yoke
Bushes 26, 26 are integrally assembled with 21d, 22d.

The locking pin body 10 has a disc-shaped stopper 12 fitted in the center of a nonmagnetic plunger 11, and further has a stopper 12.
The cylindrical suction members 13, 13 are fixed to both sides of the suction member. The plunger 11 is connected via yokes 21d and 22d, bushes 26 and 26,
The moving member is inserted into the locking solenoid 21 and the unwinding solenoid 22. That is, the plunger 11 is
Through the through hole 23c of the cover 23 and the through hole 24a of the cover 24.
23 are movably inserted along the axis CL of the space 23a. The plunger 11 is made of a non-magnetic material, and it is preferable to use a bar made of, for example, stainless steel or ceramics.

The suction members 13, 13 are made of a ferromagnetic material, and the yokes 21d, 22d
Is formed on a slope, and at the stroke limit, a yoke similarly formed on the slope.
The end faces 21d and 22d face each other via a minute gap δ. The stopper 12 is made of a non-magnetic material, and when the locking pin body 10 moves, abuts against the locking solenoid 21 and the flange surface of the bobbins 21b and 22b of the unwinding solenoid 22,
The stroke limit is regulated.

The locking pin body 10 is formed so that both ends of the plunger 11 can be used as locking portions for the weft. The dimensions are as follows: when the thickness of the stopper 12 is ds, the protrusion lengths L1 and L2 on both sides of the stopper 12 and the total length L are ds + L1 + L2 (FIG. 3), L1 = L2, and one side of the stopper 12 is When abutting against the bobbin 21b of the locking solenoid 21, one end of the plunger 11 is connected to the stroke d of the locking pin body 10.
And project from the lower surface of the body 23 by the same length as that shown in FIG. 1 (FIG. 1). However, the stroke d is the spacer 25a, 2
For the thicknesses da and db of 5b, d = da + db-ds = do-ds, where do = da + db is the locking solenoid 21 and the unwinding solenoid determined by the thickness of the spacers 25a and 25b.
There are 22 intervals.

The locking pin device having such a configuration is provided with a bracket BK so that the locking pin main body 10 can move forward and backward with respect to the surface of the drum D in the vicinity of the front end surface of the drum D of the length measuring device. (Fig. 2). Behind the drum D, a hollow rotary yarn guide D1 is disposed, and a weft (not shown) is supplied through the inside of the rotary yarn guide D1, and the rotary yarn guide D1 rotates. It is wound and stored. From the locking solenoid 21 and the unwinding solenoid 22, wires C, C with connectors C1, C1 are pulled out and connected to a solenoid driving device (not shown).

Now, when the locking solenoid 21 is excited, the locking pin body
1 is driven downward in FIG. 1. At this time, if the gap dd between the body 23 and the drum D is set to dd <d, the tip of the locking pin main body 10 protrudes into the surface of the drum D and engages. Since the stop position is set (the same figure), the weft wound and stored on the surface of the drum D can be prevented from being unwound in the direction of the arrow K in FIG. In this case, the depth dk at which the tip of the locking pin body 10 enters the drum D is dk = d-dd
It has become.

When the locking solenoid 21 is demagnetized and the unwinding solenoid 22 is excited, the locking pin main body 10 is driven upward in FIG. Since the gap dd with the drum D is free, unwinding of the weft from the drum D can be permitted. At this time, the number of turns of the weft unwound from the drum D can be counted by an unillustrated unwind sensor inserted into the mounting hole 23d.

When the locking solenoid 21 is excited, most of the magnetic flux is supplied to the bobbin 21 b made of a ferromagnetic material and the solenoid holder 21.
a, the timing circuit including the yoke 21d and the suction member 13 on the side corresponding to the locking solenoid 21 is recirculated. Therefore, if the body 23 and the spacer 25 are formed of a non-magnetic pair material such as aluminum, there is a possibility that the leakage magnetic flux from the locking solenoid 21 will interlink with the unwinding solenoid 22.
Almost none.

The same applies to the case where the unwinding solenoid 22 is excited. Therefore, the leakage magnetic flux between the locking solenoid 21 and the unwinding solenoid 22 can be sufficiently reduced. The differential of the body 10 can be very responsive.

The tip of the plunger 11 projecting downward from the body 23 may have a thread hit due to long-term use. At that time, the cover 24 is removed, and the locking pin body 10 is turned upside down, so that a new tip can be used. In addition, the engagement portion of the weft formed at the tip of the plunger 11, the plunger 11 itself is formed of a hard wear-resistant material, or at least the tip portion is coated with a hard material so that the yarn is hardly hit. Preferably.

Another Embodiment In the previous embodiment, if the spacer 25b having a thickness of db is moved to the upper surface of the unwinding solenoid 22 (FIG. 4), the stroke of the locking pin main body 10 becomes d1 = da−ds <d. Can be shortened. At this time, the locking solenoid of the locking pin body 10
By reducing the length of the protrusion on the 21 side to L2-db, the tip of the locking pin body 10 can be made to coincide with the lower end of the body 23 when the locking pin body 10 is driven to the unwinding position. However, in this case, the gap between the body 23 and the drum D is dd1 =
It is assumed that the entire length measuring device is brought closer to the drum D so that d1−dk <dd.

Generally, the spacers 25a and 25b interposed between the locking solenoid 21 and the unwinding solenoid 22 divide the pressure into two or more arbitrary numbers and move a part of them to the upper surface side of the unwinding solenoid 22. Thereby, the stroke of the locking pin main body 10 can be arbitrarily changed. At this time, the protruding length L2 of the plunger 11 on the locking solenoid 21 side is preferably determined so that the tip thereof coincides with the lower end of the body 23 when the locking pin body 10 is driven to the unwinding position. Further, when the locking pin body 10 is driven to the locking position, it is preferable that the depth dk of the leading end of the locking pin body 10 entering the drum D be kept constant irrespective of the stroke of the locking pin body 10. If the depth dk is too large, the response time of the locking pin main body 10 becomes long, and if it is too small, the locking operation of the weft may become unstable.

Effects of the Invention As described above, according to the present invention, a nonmagnetic plunger, a nonmagnetic stopper attached to an intermediate portion thereof, and a pair of ferromagnetic absorbing members fixed to both sides of the stopper are provided. By combining the locking pin body consisting of the locking solenoid and the unwinding solenoid, it is possible to effectively prevent the leakage magnetic flux generated when one of the solenoids is excited from interlinking with the other solenoid. It can greatly improve the responsiveness of the entire operation, and can sufficiently cope with the high-speed operation of the loom.In addition, by forming weft locking portions at both ends of the plunger, the service life of the locking pin body can be improved. There is an excellent effect that can be doubled.

[Brief description of the drawings]

1 to 3 show an embodiment, FIG. 1 is an explanatory view of a central longitudinal section, FIG. 2 is an explanatory view of a use state, and FIG. 3 is an exploded perspective explanatory view. FIG. 4 is a diagram corresponding to FIG. 1 showing another embodiment. 10 Locking pin body 11 Plunger 12 Stopper 13 Suction member 21 Locking solenoid 22 Unwinding solenoid 25a, 25b Spacer

Claims (3)

(57) [Claims] A locking pin main body, a locking solenoid for driving the locking pin main body to a locking position, and an unwinding solenoid for driving the locking pin main body to an unwinding position; The pin body includes a non-magnetic material plunger movably inserted into the locking solenoid and the unwinding solenoid, a non-magnetic material stopper attached to an intermediate portion of the plunger, and A weft locking pin device for a loom, comprising a pair of ferromagnetic suction members fixed to a plunger, wherein weft locking portions are formed at both ends of the plunger. A plurality of spacers interposed between the locking solenoid and the unwinding solenoid, and a part of the spacer is moved to an upper surface side of the unwinding solenoid to thereby form the locking pin main body. The weft locking pin device for a loom according to claim 1, wherein the stroke can be changed. 3. A plunger according to claim 2, wherein said plungers have different projecting lengths on both sides of said stopper.
Item 3. A weft locking pin device for a loom according to Item 1.